CN104953541B - A kind of overvoltage protection - Google Patents
A kind of overvoltage protection Download PDFInfo
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- CN104953541B CN104953541B CN201510459110.9A CN201510459110A CN104953541B CN 104953541 B CN104953541 B CN 104953541B CN 201510459110 A CN201510459110 A CN 201510459110A CN 104953541 B CN104953541 B CN 104953541B
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Abstract
This application discloses a kind of overvoltage protections, including the first filter circuit, relay, rectifier bridge, the first regulator circuit, DC source, N type switch tube and switch controlled circuit, wherein：First input pin of the first filter circuit is started to exchange fire line, and the second input pin connects zero curve；Rectifier bridge is connected to the outlet side of the first filter circuit；First regulator circuit is connected to the outlet side of rectifier bridge；The normally opened contact of relay is connected between household electrical appliance and zero curve；Coil of the electrical energy inputs of N type switch tube through relay is connected to DC source, the electric energy output end ground connection of N type switch tube；Switch controlled circuit connects the outlet side of the control terminal and the first regulator circuit of N type switch tube respectively, for when the output voltage for detecting the first regulator circuit is higher than preset value, control N type switch tube cut-off, it is on the contrary, the N type switch tube conducting is controlled, overvoltage is burnt due to electrician's wrong line so as to avoid household electrical appliance.
Description
Technical field
The present invention relates to power electronics fields, more specifically to a kind of overvoltage protection.
Background technology
Electrician may cause overvoltage because wiring is made a fault, cause household electric during repairing circuit
Device large area is burnt, and immeasurable loss is caused to the people's lives and property.Therefore, how to realize overvoltage protection, become
Electric power enterprise urgent problem to be solved.
Invention content
In view of this, the present invention provides a kind of overvoltage protection, to avoid household electrical appliance due to electrician's wrong line mistake
Pressure is burnt.
A kind of overvoltage protection, including the first filter circuit, relay, rectifier bridge, the first regulator circuit, direct current
Source, N type switch tube and switch controlled circuit, wherein：
First input pin of first filter circuit is started to exchange fire line, and the second input pin connects zero curve；
The rectifier bridge is connected to the outlet side of first filter circuit；
First regulator circuit is connected to the outlet side of the rectifier bridge；
The normally opened contact of the relay is connected between household electrical appliance and the zero curve；
Coil of the electrical energy inputs of the N type switch tube through the relay is connected to the DC source, and the N-type is opened
Close the electric energy output end ground connection of pipe；
The switch controlled circuit connects the output of the control terminal and first regulator circuit of the N type switch tube respectively
Side, for when the output voltage for detecting first regulator circuit is higher than preset value, controlling the N type switch tube cut-off,
Conversely, controlling the N type switch tube conducting.
Wherein, the switch controlled circuit includes that optocoupler, three ends may be programmed shunt regulator diode, first resistor, the
Two resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, RC absorbing circuits, the second regulator circuit and third voltage stabilizing
Circuit, specifically：
Three end, which may be programmed shunt regulator diode, has three reference edge, cathode and anode ports；The reference edge
The positive output end of first regulator circuit is connect through the first resistor；Three end may be programmed the anode of shunt regulator diode
Ground connection, while connecing the reference edge through the second resistance；Three end may be programmed described in the cathode warp of shunt regulator diode
RC absorbing circuits connect the reference edge, while connecing the output of the DC source through the 6th resistance and the 5th resistance successively
End；
The cathode of light emitting diode in the optocoupler connects the cathode that three end may be programmed shunt regulator diode, described
The anode of light emitting diode connects the tie point of the 6th resistance and the 5th resistance；
The collector of photoreceptor in the optocoupler connects the output end of the DC source, the light through the 4th resistance
The emitter of body is grounded；
The control of the N type switch tube terminates the collector of the photoreceptor, while being grounded through the 3rd resistor；
Second regulator circuit is connected to the cathode Cathode and ground that three ends may be programmed shunt regulator diode IC2
Between；
The third regulator circuit is connected in parallel on the both ends 3rd resistor R3.
Wherein, it is TL431 model chips that three end, which may be programmed shunt regulator diode,.
Optionally, the switch controlled circuit further includes the first diode, the first light emitting diode and the 8th resistance,
In：
The anode of first light emitting diode connects the output end of the DC source, first hair through the 8th resistance
The cathode of optical diode connects the collector of the N type switch tube；
The cathode of first diode connects the output end of the DC source, and the anode of first diode meets the N
The collector of type switching tube.
Wherein, the DC source includes LNK304PN chips, the 9th resistance, the tenth resistance, the second diode, the three or two pole
Pipe, the first inductance, shunt capacitance, the 4th regulator circuit and the 5th regulator circuit, specifically：
The pin FB of the LNK304PN chips connects through the tenth resistance and the shunt capacitance described successively
The pin S of LNK304PN chips, while connecing through the 9th resistance cathode of second diode；
The pin D of the LNK304PN chips connects the positive output end of first regulator circuit；
The anode of the third diode connects the negative output terminal of first regulator circuit, the cathode of the third diode
Meet the pin S；
First inductance connection is between the pin S and the anode of second diode；
The anode of second diode is the output end of the DC source；
4th regulator circuit is connected to the cathode side of the second diode D2；
5th regulator circuit is connected to the anode-side of the second diode D2.
Optionally, the DC source further includes：Second light emitting diode and eleventh resistor, wherein：
The minus earth of second light emitting diode, the anode of second light emitting diode is through the eleventh resistor
Connect the anode of second diode.
Wherein, first filter circuit includes the second inductance, third inductance and filter capacitor, wherein：
The first termination firewire of second inductance, an input terminal of the second termination rectifier bridge；
The first termination zero curve of the third inductance, another input terminal of the second termination rectifier bridge；
The filter capacitor is connected between the first end of second inductance and the first end of the third inductance.
Optionally, the overvoltage protection further includes：Twelfth resistor, the twelfth resistor are connected to the filter
Between wave capacitance and the zero curve.
Wherein, the N type switch tube is NPN type triode, N-type Darlington transistor or N-type MOSFET.
Optionally, the overvoltage protection further includes contactor, wherein：The coil of the contactor is connected to described
Between the normally opened contact of relay and the firewire；The normally opened contact of the contactor is connected on the firewire and the household electrical appliance
Between.
It can be seen from the above technical scheme that the present invention is by being filtered AC supply voltage, rectification and steady
After pressure processing, corresponding DC voltage is obtained；The DC voltage is considered as by switch controlled circuit not higher than preset value not to be sent out
The DC voltage is considered as generation overvoltage higher than the preset value, and is carried out accordingly to N type switch tube different by raw overvoltage
Control, specially：In the case where overvoltage does not occur, switch controlled circuit control N type switch tube conducting, so that relay
The coil of device obtains electric, and normally opened contact is closed, and household electrical appliance start to work normally；And N-type switch is then controlled under over-voltage condition
Pipe ends, so that the coil no power of relay, normally opened contact disconnects, and household electrical appliance are stopped, so as to avoid household
Electric appliance due to electrician's wrong line burn by overvoltage.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of overvoltage protection structural schematic diagram disclosed by the embodiments of the present invention；
Fig. 2 is another overvoltage protection structural schematic diagram disclosed by the embodiments of the present invention；
Fig. 3 is another overvoltage protection structural schematic diagram disclosed by the embodiments of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the invention discloses a kind of overvoltage protections, to avoid household electrical appliance because of electrician's wrong
Line and overvoltage is burnt, including the first filter circuit 100, relay KF, rectifier bridge 200, the first regulator circuit 300, DC source
400, N type switch tube Q1 and switch controlled circuit 500, wherein：
First input pin of the first filter circuit 100 is started to exchange fire line L, and the second input pin meets zero curve N；
Rectifier bridge 200 is connected to the outlet side of the first filter circuit 100；
First regulator circuit 300 is connected to the outlet side of rectifier bridge 200；
The normally opened contact of relay KF is connected between household electrical appliance and zero curve N；
Coil of the electrical energy inputs of N type switch tube Q1 through relay KF is connected to DC source 400, N type switch tube Q1's
Electric energy output end is grounded；
Switch controlled circuit 500 connects the outlet side of the control terminal and the first regulator circuit 300 of N type switch tube Q1 respectively,
For when the output voltage for detecting the first regulator circuit 300 is higher than preset value, controlling N type switch tube Q1 cut-offs, conversely, control
N type switch tube Q1 conductings processed.
Household electricity is single-phase electricity, if careless electrician's wrong line make should the wiring of a firewire, a zero curve be connected into
Two firewires are connected together, and may result in AC supply voltage and become 380VAC from 220VAC, cause most of to connect exchange
The household electrical appliance of power supply are damaged because cannot withstand high pressure.In order to solve this problem, present embodiment discloses as described above
Overvoltage protection, its working principle is that：
AC supply voltage passes through the filtering of the first filter circuit 100, the rectification and the first voltage stabilizing of rectifier bridge 200 successively
After the voltage stabilizing of circuit 300, corresponding DC voltage is obtained；Switch controlled circuit 500 is by the DC voltage not higher than default
Value is considered as electric system and overvoltage does not occur, and the DC voltage is considered as electric system higher than the preset value occurred electricity
Pressure, and different controls are carried out to N type switch tube Q1 accordingly, specially：In the case where overvoltage does not occur, switch controlled electricity
Road 500 controls N type switch tube Q1 conducting, so that the coil of relay KF obtains electric, normally opened contact is closed, and household electrical appliance start just
Often work；And N type switch tube Q1 cut-offs are then controlled under over-voltage condition, so that the coil no power of relay KF, normally opened
Contact disconnects, and household electrical appliance are stopped, to realize over-voltage protection function.
Theoretically, the preset value should be set asBut in view of household electrical appliance can usually bear one
The overvoltage of tentering degree generally can reach 220 (1+10%)=242VAC, therefore can be according to actual conditions, by the preset value
It is set asIn range a certain value (For the rectified value of 220VAC,For the rectified value of 242VAC).
Next, the structure and function to individual building blocks of the overvoltage protection carry out going deep into explanation：
1) about N type switch tube Q1
NPN type triode may be used in N type switch tube Q1, and (Fig. 1 is only NPN type triode as showing using N type switch tube Q1
Example), N-type Darlington transistor or N-type MOSFET (Metal Oxide Semiconductor FET, MOS field
Effect transistor).When N type switch tube Q1 uses NPN type triode or N-type Darlington transistor, the control terminal of N type switch tube Q1
Electrical energy inputs for base stage, N type switch tube Q1 are collector, and the electric energy output end of N type switch tube Q1 is emitter；Work as N-type
When switching tube Q1 uses N-type MOSFET, the control terminal of N type switch tube Q1 is grid, and the electrical energy inputs of N type switch tube Q1 are leakage
The electric energy output end of pole, N type switch tube Q1 is source electrode.
2) about switch controlled circuit 500
Referring to Fig. 2, switch controlled circuit 500 includes optocoupler IC1, the programmable shunt regulator diode IC2 in three ends, first
Resistance R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, RC absorbing circuit, second
Regulator circuit and third regulator circuit, wherein：
Three ends, which may be programmed shunt regulator diode IC2, has reference edge Ref, cathode Cathode and tri- ends anode A node
Mouthful；Reference edge Ref meets the positive output end P+ of the first regulator circuit 300 through first resistor R1；Anode A node ground connection, while through the
Two resistance R2 meet reference edge Ref；Cathode Cathode meets reference edge Ref through RC absorbing circuits, at the same successively through the 6th resistance R6 and
5th resistance R5 meets the output end V+ of DC source 400；
The cathode of light emitting diode in optocoupler IC1 meets cathode Cathode, and the anode of the light emitting diode connects the 6th electricity
Hinder the tie point of R6 and the 5th resistance R5；
The collector c of photoreceptor in optocoupler IC1 connects the output end V+ of DC source 400, the light through the 4th resistance R4
The emitter e of body is grounded；
The control of N type switch tube Q1 terminates the collector c of the photoreceptor, while being grounded through 3rd resistor R3；
Second regulator circuit is connected to the cathode Cathode and the earth that three ends may be programmed shunt regulator diode IC2
Between；
The third regulator circuit is connected in parallel on the both ends 3rd resistor R3.
Wherein, the working characteristics of the programmable shunt regulator diode IC2 in three ends is：When between reference edge Ref and anode A node
Voltage difference when being more than the reference voltage that three ends may be programmed shunt regulator diode IC2, three ends may be programmed shunt regulator diode
The anode A node of IC2 is connected with cathode Cathode；When the voltage difference between reference edge Ref and anode A node is not higher than the base
When quasi- voltage, three ends may be programmed shunt regulator diode IC2 cut-offs.Three ends may be programmed the model choosing of shunt regulator diode IC2
It can be LMV431 models (reference voltage of LMV431 is 1.24V) to select, and can also be the TL431 models (reference voltage of TL431
For 2.5V), but do not limit to.
Wherein, PC817 chips can be used in optocoupler IC1, but do not limit to.
Wherein, the cascaded structure of the 7th resistance R7 and capacitance C1 can be used in RC absorption circuits, and the cascaded structure is for absorbing
Three ends may be programmed the surge current discharged when shunt regulator diode IC2 is switched to cut-off state from conducting, protection switch management and control
Sensitive electronics in circuit 500 processed are interference-free.
In the following, the operation principle of switch controlled circuit 500 is discussed in detail：
First, according to " when P+ is equal to preset value, the partial pressure value of second resistance R2 is equal to three ends and may be programmed parallel voltage-stabilizing two
First resistor R1 and second resistance R2 is rationally arranged in P in the principle of the reference voltage of pole pipe IC2 "+Intrinsic standoff ratio between the earth；
Since the partial pressure value of second resistance R2 is equal to the voltage difference between reference edge Ref and anode A node, work as P+
When not higher than the preset value, illustrate that the voltage difference between reference edge Ref and anode A node is not higher than reference voltage, three ends can compile
The IC2 cut-offs of journey shunt regulator diode, the light emitting diode no power in optocoupler IC1 would not also emit beam at this time, optocoupler
Photoreceptor in IC1, which does not receive light, also cannot be such that the emitter e of itself is connected with collector c, at this time 3rd resistor R3
It is divided, positive bias can be provided for the control terminal of N type switch tube Q1 so that N type switch tube Q1 conductings；
When P+ is higher than the preset value, three ends may be programmed the cathode Cathode and anode of shunt regulator diode IC2
It is connected between Anode, the light emitting diode in optocoupler IC1 is obtained electric and emitted beam, and the photoreceptor in optocoupler IC1 receives after light
The emitter e of itself is set to be connected with collector c, 3rd resistor R3 is short-circuited at this time, cannot be carried for the control terminal of N type switch tube Q1
For positive bias, therefore N type switch tube Q1 ends, and realizes over-voltage protection function.
The 4th resistance R4, the 5th resistance R5, the 6th resistance R6, second voltage stabilizing electricity in switch controlled circuit 500
The function of road and the third regulator circuit is as follows：
4th resistance R4 is divider resistance, by the intrinsic standoff ratio for adjusting the 4th resistance R4 and 3rd resistor R3, it is ensured that light
The control terminal of N type switch tube Q1 can obtain sizeable positive bias when the emitter e of coupling IC1 is connected with collector c；
5th resistance R5 is current-limiting resistance, will not be because of overcurrent when ensureing that the light emitting diode in optocoupler IC1 is powered
And it damages；
6th resistance R6 prevents the programmable parallel connection in three ends for playing the role of partial pressure when emitter e is connected with collector c
Zener diode IC2 excessive pressure damages；
Second regulator circuit is used to stablize the cathode Cathode voltages that three ends may be programmed shunt regulator diode IC2,
Capacitance E1 as shown in Figure 2 specifically can be used to realize；
The third regulator circuit is for stablizing 3rd resistor R3 both end voltages, to make the control terminal of N type switch tube Q1
Obtain stable positive bias.The third regulator circuit specifically may be used capacitance E2 as shown in Figure 2 and realize.
Optionally, referring also to Fig. 2, switch controlled circuit 500 further includes：It is connected in parallel on second filter at the both ends 3rd resistor R3
Wave circuit, the positive bias for the control terminal acquisition to N type switch tube Q1 are filtered.Second filter circuit can be used as
Capacitance C2 shown in Fig. 2.
Optionally, referring also to Fig. 2, switch controlled circuit 500 further includes the first diode D1, the first light emitting diode
LED1 and the 8th resistance R8, wherein：The anode of first Light-emitting diode LED 1 connects the output end of DC source 400 through the 8th resistance R8
The cathode of V+, the first Light-emitting diode LED 1 meet the collector c of N type switch tube Q1；The cathode of first diode D1 connects DC source
The anode of 400 output end V+, the first diode D1 meet the collector c of N type switch tube Q1.
When N type switch tube Q1 is connected, the first Light-emitting diode LED 1 shines, when N type switch tube Q1 ends, the first hair
Optical diode LED1 does not shine, whether can facilitating the overvoltage of monitoring electric system accordingly；8th resistance R8 is current-limiting resistance, is used
In preventing 1 overcurrent damage of the first Light-emitting diode LED；First diode D1 is fly-wheel diode, for will break because of DC source 400
Electricity and cause generated reverse potential when the coil losing electricity of relay KF to discharge.
3) about DC source 400
Referring to Fig. 2, DC source 400 includes LNK304PN chip ICs 3, the 9th resistance R9, the tenth resistance R10, the two or two pole
Pipe D2, third diode D3, the first inductance L1, shunt capacitance C3, the 4th regulator circuit and the 5th regulator circuit, wherein：
Pin Ss of the pin FB of LNK304PN chip ICs 3 through the tenth resistance R10 connection LNK304PN chip ICs 3, passes through simultaneously
9th resistance R9 connects the cathode of the second diode D2, and the pin BP of LNK304PN chip ICs 3 is through shunt capacitance C3 connections
The pin S of LNK304PN chip ICs 3；
The pin D of LNK304PN chip ICs 3 connects the positive output end of the first regulator circuit 300；
The anode of third diode D3 connects the negative output terminal of the first regulator circuit 300, and the cathode of third diode D3, which connects, to be drawn
Foot S；
First inductance L1 is connected between pin S and the anode of the second diode D2；
The anode of second diode D2 is the output end V+ of DC source 400；
4th regulator circuit is connected to the cathode side of the second diode D2；
5th regulator circuit is connected to the anode-side of the second diode D2.
LNK304PN chips are most common a kind of types in LinkSwitch-TN series single-chip switching power supply special chips
Number, as shown in Fig. 2, LNK304PN model chips have 8 pins, wherein：6th pin is not drawn, and the 5th pin D is inside
MOSFET drains, and provides operating current for inside；1st, 2,7,8 pin S are internal MOSFET source, while being reference again
Ground；3rd pin BP is the connecting pin of internal 6.3V power supplys and external bypass capacitors C3；6th pin FB is feedback end, voltage value
Constant is 1.65V.
The operation principle of DC source 400 is：Pin S is grounded through third diode D3, ignores the pressure drop of third diode D3,
Using pin S as with reference to ground, then output voltage V+=1.65/R10* (R9+R10)+VD2 of DC source 400, VD2 are the two or two
The pressure drop of pole pipe D2.By the resistance value size for adjusting the 9th resistance R9, the tenth resistance R10, you can be adjusted to the size of V+.
The effect of first inductance L1 is that anti-ripple, third diode D3 are used to make for the first inductance L1 electric discharge afterflows in grid cut-off
With.
Shunt capacitance C3's act as high frequency decoupling and energy storage use.
4th regulator circuit is used to stablize the cathode voltage of the second diode D2, specifically can be used as shown in Figure 2
Capacitance E3 is realized.
5th regulator circuit is used for the output voltage V+ in stable DC source 400, and electricity as shown in Figure 2 specifically can be used
Hold E4 to realize.
Optionally, DC source 400 further includes the second Light-emitting diode LED 2 and eleventh resistor R11, wherein：Second shines
The anode of the minus earth of diode (LED) 2, the second Light-emitting diode LED 2 connects the second diode D2's through eleventh resistor R11
Anode.When grid cut-off, the second Light-emitting diode LED 2 does not shine, whether can facilitating monitoring grid cut-off accordingly.11st electricity
Resistance R11 is current-limiting resistance, for preventing 2 overcurrent damage of the second Light-emitting diode LED.
Optionally, DC source 400 further includes：Be connected to the third filter circuit of the output end V+ of DC source 400, for pair
The output voltage V+ of DC source 400 is filtered.Capacitance C4 as shown in Figure 2 can be used in the third filter circuit.
Certainly, in addition to this, DC source 400 can also be an independent power module, such as accumulator group.
4) about the first regulator circuit 300
A capacitance may be used in first regulator circuit 300, can also use the concatenated form of multiple capacitances, concatenated mesh
Be reduce capacitance partial pressure.In view of the voltage stabilizing value of the first regulator circuit 300 is larger, therefore using such as 2 institutes in the present embodiment
The cascaded structure of the capacitance E5 and capacitance E6 that show are realized.
Certainly, in addition to the first regulator circuit 300, other regulator circuits in the present embodiment can also use an electricity
Hold, or the concatenated form of multiple capacitances may be used, concatenated purpose is to reduce capacitance partial pressure, Fig. 2 only there is provided
One such example.
5) about the first filter circuit 100
LC filter circuits, including the second inductance L2, third inductance L3 and filter capacitor may be used in first filter circuit 100
C6, wherein：
The first end of second inductance L2 is started to exchange fire line L, an input terminal of the second termination rectifier bridge 200；
The first terminal connecting zero line N of third inductance L3, another input terminal of the second termination rectifier bridge 200；
Filter capacitor C6 is connected between the first end of the second inductance L2 and the first end of third inductance L3.
In the present embodiment, capacitance C1~C5 selects ceramic disc capacitor, capacitance E1~E6 to select electrolytic capacitor, filter capacitor C6 choosings
With safety capacitance.
6) other optional building blocks
Optionally, the overvoltage protection further includes：It is connected to the 4th filter of the outlet side of the first regulator circuit 300
Wave circuit is filtered for the output voltage to the first regulator circuit 300.Capacitance can be used in 4th filter circuit
C5。
Optionally, the overvoltage protection further includes twelfth resistor R12；Twelfth resistor R12 is connected to filtering
Between capacitance C6 and zero curve N.The initial time of power grid is connected in the overvoltage protection, filter capacitor C6 is equivalent to short
Road will be constituted if the directly rectified bridge 200 of energy, the first filter circuit 100 of capacitance E5~E6 releases flow to zero curve N
Short circuit, it is therefore necessary to which twelfth resistor R12 is set to prevent short circuit.Thermistor may be used in twelfth resistor R12, but simultaneously
Do not limit to.
Optionally, the overvoltage protection further includes：The protective tube FUSE1 being serially connected on firewire L, when circuit occurs
When short trouble, protective tube FUSE1 is instanteously blown and divides terminal circuit, is played a protective role.
Optionally, referring to Fig. 3, the overvoltage protection further includes contactor KM, wherein：The coil of contactor KM connects
It is connected between the normally opened contact of relay KF and firewire L；The normally opened contact of contactor KM be connected on firewire L and the household electrical appliance it
Between.Since relay KM nominal loads are smaller, usually tens Amps, therefore the present embodiment is used as letter by relay KF
Number the contactor KF with more heavy load is controlled, to expand the scope of application of this product, control process is as follows：
When the normally opened contact of relay KF is closed, the coil of contactor KM obtains electric, the normally opened contact closure of contactor KM, family
Electrical appliance starts to work normally；After the normally opened contact of relay KF disconnects, the coil losing electricity of contactor KM, contactor KM's is normally opened
Contact disconnects, and household electrical appliance are stopped.
In conclusion the present invention by being filtered to AC supply voltage, after rectification and steady pressure treatment, obtains accordingly
DC voltage；The DC voltage is considered as not higher than preset value and overvoltage does not occur by switch controlled circuit, will be described straight
Galvanic electricity pressure is considered as generation overvoltage higher than the preset value, and carries out different controls to N type switch tube accordingly, specially：Not
Occur overvoltage in the case of, switch controlled circuit control N type switch tube conducting so that the coil of relay obtain it is electric, often
Contact closure is opened, household electrical appliance start to work normally；And N type switch tube cut-off is then controlled under over-voltage condition, so that after
The coil no power of electric appliance, normally opened contact disconnect, and household electrical appliance are stopped, so as to avoid household electrical appliance because of electrician's wrong line
And overvoltage is burnt.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent widest range of features of novelty.
Claims (9)
1. a kind of overvoltage protection, which is characterized in that including the first filter circuit, relay, rectifier bridge, the first voltage stabilizing electricity
Road, DC source, N type switch tube and switch controlled circuit, wherein：
First input pin of first filter circuit is started to exchange fire line, and the second input pin connects zero curve；
The rectifier bridge is connected to the outlet side of first filter circuit；
First regulator circuit is connected to the outlet side of the rectifier bridge；
The normally opened contact of the relay is connected between household electrical appliance and the zero curve；
Coil of the electrical energy inputs of the N type switch tube through the relay is connected to the DC source, the N type switch tube
Electric energy output end ground connection；
The switch controlled circuit connects the outlet side of the control terminal and first regulator circuit of the N type switch tube respectively,
For when the output voltage for detecting first regulator circuit is higher than preset value, controlling the N type switch tube cut-off, instead
It, controls the N type switch tube conducting；
The switch controlled circuit includes that optocoupler, three ends may be programmed shunt regulator diode, first resistor, second resistance, the
Three resistance, the 4th resistance, the 5th resistance, the 6th resistance, RC absorbing circuits, the second regulator circuit and third regulator circuit, wherein：
Three end, which may be programmed shunt regulator diode, has three reference edge, cathode and anode ports；The reference edge is through institute
State the positive output end that first resistor connects first regulator circuit；The anode that three end may be programmed shunt regulator diode connects
Ground, while connecing the reference edge through the second resistance；Three end may be programmed the cathode of shunt regulator diode through the RC
Absorbing circuit connects the reference edge, while connecing the output of the DC source through the 6th resistance and the 5th resistance successively
End；
The cathode of light emitting diode in the optocoupler connects the cathode that three end may be programmed shunt regulator diode, described to shine
The anode of diode connects the tie point of the 6th resistance and the 5th resistance；
The collector of photoreceptor in the optocoupler connects the output end of the DC source through the 4th resistance, the photoreceptor
Emitter is grounded；
The control of the N type switch tube terminates the collector of the photoreceptor, while being grounded through the 3rd resistor；
Second regulator circuit is connected between the cathode and ground that three ends may be programmed shunt regulator diode；
The third regulator circuit is connected in parallel on the both ends 3rd resistor R3.
2. overvoltage protection according to claim 1, which is characterized in that three end may be programmed two pole of parallel voltage-stabilizing
Pipe is TL431 model chips.
3. overvoltage protection according to claim 1 or 2, which is characterized in that the switch controlled circuit also wraps
The first diode, the first light emitting diode and the 8th resistance are included, wherein：
The anode of first light emitting diode connects the output end of the DC source through the 8th resistance, and described first shines two
The cathode of pole pipe connects the collector of the N type switch tube；
The cathode of first diode connects the output end of the DC source, and the anode of first diode connects the N-type and opens
Close the collector of pipe.
4. overvoltage protection according to claim 1, which is characterized in that the DC source includes LNK304PN cores
Piece, the 9th resistance, the tenth resistance, the second diode, third diode, the first inductance, shunt capacitance, the 4th regulator circuit and
Five regulator circuits, wherein：
The pin FB of the LNK304PN chips connects the pin S of the LNK304PN chips through the tenth resistance, passes through simultaneously
9th resistance connects the cathode of second diode, and the pin BP of the LNK304PN chips is connected through the shunt capacitance
The pin S of the LNK304PN chips；
The pin D of the LNK304PN chips connects the positive output end of first regulator circuit；
The anode of the third diode connects the negative output terminal of first regulator circuit, and the cathode of the third diode meets institute
State pin S；
First inductance connection is between the pin S and the anode of second diode；
The anode of second diode is the output end of the DC source；
4th regulator circuit is connected to the cathode side of the second diode D2；
5th regulator circuit is connected to the anode-side of the second diode D2.
5. overvoltage protection according to claim 4, which is characterized in that the DC source further includes：Second shines
Diode and eleventh resistor, wherein：
The anode of the minus earth of second light emitting diode, second light emitting diode meets institute through the eleventh resistor
State the anode of the second diode.
6. overvoltage protection according to claim 1, which is characterized in that first filter circuit includes the second electricity
Sense, third inductance and filter capacitor, wherein：
The first termination firewire of second inductance, an input terminal of the second termination rectifier bridge；
The first termination zero curve of the third inductance, another input terminal of the second termination rectifier bridge；
The filter capacitor is connected between the first end of second inductance and the first end of the third inductance.
7. overvoltage protection according to claim 6, which is characterized in that the overvoltage protection further includes：
Twelfth resistor, the twelfth resistor are connected between the filter capacitor and the zero curve.
8. overvoltage protection according to claim 1, which is characterized in that the N type switch tube is three pole of NPN type
Pipe, N-type Darlington transistor or N-type MOSFET.
9. overvoltage protection according to claim 1, which is characterized in that the overvoltage protection further includes connecing
Tentaculum, wherein：The coil of the contactor is connected between the normally opened contact of the relay and the firewire；The contactor
Normally opened contact be connected between the firewire and the household electrical appliance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510459110.9A CN104953541B (en) | 2015-07-29 | 2015-07-29 | A kind of overvoltage protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510459110.9A CN104953541B (en) | 2015-07-29 | 2015-07-29 | A kind of overvoltage protection |
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| Publication Number | Publication Date |
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| CN104953541A CN104953541A (en) | 2015-09-30 |
| CN104953541B true CN104953541B (en) | 2018-08-24 |
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| CN201510459110.9A Active CN104953541B (en) | 2015-07-29 | 2015-07-29 | A kind of overvoltage protection |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6930336B2 (en) * | 2017-09-27 | 2021-09-01 | ヤマハ株式会社 | Power supply circuit and audio equipment |
| CN109036962B (en) * | 2018-10-08 | 2024-02-09 | 上海西艾爱电子有限公司 | Energy-saving driving circuit for relay coil |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2814754Y (en) * | 2005-06-27 | 2006-09-06 | 刘文钊 | Power off-overvoltage protector |
| CN101237137A (en) * | 2007-01-30 | 2008-08-06 | 鸿富锦精密工业（深圳）有限公司 | Over voltage and under-voltage device |
| CN202586774U (en) * | 2012-05-10 | 2012-12-05 | 冠捷投资有限公司 | Power supply unit with overvoltage protection |
| CN103606895A (en) * | 2013-12-06 | 2014-02-26 | 悉雅特万科思自动化(杭州)有限公司 | Overvoltage turn-off protection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI393339B (en) * | 2008-07-29 | 2013-04-11 | Pegatron Corp | Power adapter and transformation method |
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2015
- 2015-07-29 CN CN201510459110.9A patent/CN104953541B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2814754Y (en) * | 2005-06-27 | 2006-09-06 | 刘文钊 | Power off-overvoltage protector |
| CN101237137A (en) * | 2007-01-30 | 2008-08-06 | 鸿富锦精密工业（深圳）有限公司 | Over voltage and under-voltage device |
| CN202586774U (en) * | 2012-05-10 | 2012-12-05 | 冠捷投资有限公司 | Power supply unit with overvoltage protection |
| CN103606895A (en) * | 2013-12-06 | 2014-02-26 | 悉雅特万科思自动化(杭州)有限公司 | Overvoltage turn-off protection circuit |
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|---|---|
| CN104953541A (en) | 2015-09-30 |
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Address after: 510000 No.1 by helongsha villager group, Shengli village, Lishui Town, Nanhai District, Foshan City, Guangdong Province Patentee after: Guangdong Kaili HVAC Co.,Ltd. Address before: 510000 No.1 by helongsha villager group, Shengli village, Lishui Town, Nanhai District, Foshan City, Guangdong Province Patentee before: GUANGDONG CHIGO HEATING AND VENTILATION EQUIPMENT Co.,Ltd. |